dɪˈkeɪ di.ˈkeɪ ˌdiːkəmˈpəʊz dɪsˈɪntɪɡɹeɪt break into parts or components or lose cohesion or unity The material disintegrated the group disintegrated after the leader died lose a stored charge, magnetic flux, or current the particles disintegrated during the nuclear fission process cause to undergo fission or lose particles